Holly Peek, a ranger for Red Squirrel Trust Wales, said: "If it is pox the chances are it has spread from Treborth as the squirrels can travel back and forth from the mainland. So far we've had one confirmed case and two dead bodies which we are still awaiting the results for."

One dead squirrel was found in Coed Mor near the Britannia Bridge and another near Parc Menai, in Gwynedd.